Fix background crash when FlutterView is being presented while app being move to background

Ye Chunlin · Ye Chunlin · commit 692e027a2fe0 · 2020-12-18T15:04:57.000+08:00
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterViewController.mm b/shell/platform/darwin/ios/framework/Source/FlutterViewController.mm
@@ -629,6 +629,9 @@ - (void)viewDidAppear:(BOOL)animated {
   [[_engine.get() lifecycleChannel] sendMessage:@"AppLifecycleState.resumed"];
 
   [super viewDidAppear:animated];
+  if (UIApplication.sharedApplication.applicationState == UIApplicationStateBackground) {
+    [[_engine.get() lifecycleChannel] sendMessage:@"AppLifecycleState.paused"];
+  }
 }
 
 - (void)viewWillDisappear:(BOOL)animated {

Original file line number	Diff line number	Diff line change
`@@ -629,6 +629,9 @@ - (void)viewDidAppear:(BOOL)animated {`
`629`	`629`	`[[_engine.get() lifecycleChannel] sendMessage:@"AppLifecycleState.resumed"];`
`630`	`630`
`631`	`631`	`[super viewDidAppear:animated];`
	`632`	`+ if (UIApplication.sharedApplication.applicationState == UIApplicationStateBackground) {`
	`633`	`+ [[_engine.get() lifecycleChannel] sendMessage:@"AppLifecycleState.paused"];`
	`634`	`+ }`
`632`	`635`	`}`
`633`	`636`
`634`	`637`	`- (void)viewWillDisappear:(BOOL)animated {`